Mark McCollum

Universal Compression Partners LP provides natural gas contract compression services to customers nationwide. Its services include designing, installing, operating, repairing, and maintaining compression equipment. Following the company's IPO, it will operate a fleet of compressor units, comprising more than 331,000 horsepower, or some 17% of parent and global compression. It is located in Houston, TX.

Marathon Oil Co. engages in exploring, transporting and markets crude oil and natural gas properties. The company is headquartered in Houston, TX.

Halliburton Energy Services, Inc. provides oilfield services. It offers technical products and services for petroleum, natural gas exploration and production. The company is headquartered in Houston, TX.

Arthur Andersen LLP used to provide accounting services. It was also into consulting services for clients that operate businesses throughout the United States and around the world. Arthur Andersen was founded in 1913 and was headquartered in Chicago, IL.

Halliburton Group Canada, Inc. provides products and services to the oil & gas industry. Its services include locating hydrocarbons, managing geological data, drilling, formation evaluation, well construction and completion and optimizing production. The company was founded in 1926 and is located in Calgary, AB.

The American Institute of Certified Public Accountants provides vocational education in accounting. The company provides services to the accounting community, regulatory bodies, and other organizations. It also operates in Jersey City, Washington, and Lewisville. It was founded in 1887 and is headquartered in New York City, NY.

Institute of Management Accountants, Inc. provides accountants and financial services. The company was founded in 1919 and is headquartered in Montvale, NJ.

Financial Executives International enhances member professional development through peer networking, career planning services, conferences, publications and special reports, and research. Its members include Chief Financial Officers, Vice Presidents of Finance, Treasurers, and Controllers. The company was founded in December 1931 and is headquartered in Morristown, NJ.

Archrock Partners LP, engages in the provision of natural gas compression services. The firm designs, owns, installs, operates, repairs, and maintains equipment to provide natural gas compression services to customers. It also owns and operates a natural gas processing plant. The company was founded on October 10, 2006 and is headquartered in Houston, TX.

Petris Technology, Inc. develops and markets integrated data management analytics and business intelligence software for oil and gas companies. The company was founded by Timothy Burkett in 1994 and is headquartered in Houston, TX.

Seadrill Ltd. engages in the provision of offshore drilling services to the oil and gas industry. It operates through the following segments: Harsh Environment, Floaters, Jack-up rigs, and Other. The Harsh Environment segment include both semi-submersibles and jack-ups that have a number of design modifications to be able to handle to weather conditions as seen in the North Sea and Canada. The Floaters segment encompasses drilling, completion, and maintenance of offshore exploration and production wells. the Jack-up Rigs segment includes drilling contracts relate to jack-up rigs for operations in harsh and benign environments in shallow water. The Other segment represents management services to third parties and related parties. The company was founded on May 10, 2005 and is headquartered in Hamilton, Bermuda.